path: root/plugin/evm/block.go

// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.

package evm

import (
	"errors"
	"fmt"
	"math/big"

	"github.com/ava-labs/coreth/core/types"
	"github.com/ethereum/go-ethereum/log"
	"github.com/ethereum/go-ethereum/rlp"

	"github.com/ava-labs/avalanchego/ids"
	"github.com/ava-labs/avalanchego/snow/choices"
	"github.com/ava-labs/avalanchego/snow/consensus/snowman"
	"github.com/ava-labs/avalanchego/vms/components/missing"
)

// Block implements the snowman.Block interface
type Block struct {
	id       ids.ID
	ethBlock *types.Block
	vm       *VM
}

// ID implements the snowman.Block interface
func (b *Block) ID() ids.ID { return b.id }

// Accept implements the snowman.Block interface
func (b *Block) Accept() error {
	vm := b.vm

	log.Trace(fmt.Sprintf("Block %s is accepted", b.ID()))
	vm.updateStatus(b.id, choices.Accepted)
	if err := vm.acceptedDB.Put(b.ethBlock.Number().Bytes(), b.id[:]); err != nil {
		return err
	}

	tx := vm.getAtomicTx(b.ethBlock)
	if tx == nil {
		return nil
	}
	utx, ok := tx.UnsignedTx.(UnsignedAtomicTx)
	if !ok {
		return errors.New("unknown tx type")
	}

	return utx.Accept(vm.ctx, nil)
}

// Reject implements the snowman.Block interface
func (b *Block) Reject() error {
	log.Trace(fmt.Sprintf("Block %s is rejected", b.ID()))
	b.vm.updateStatus(b.ID(), choices.Rejected)
	return nil
}

// Status implements the snowman.Block interface
func (b *Block) Status() choices.Status {
	status := b.vm.getCachedStatus(b.ID())
	if status == choices.Unknown && b.ethBlock != nil {
		return choices.Processing
	}
	return status
}

// Parent implements the snowman.Block interface
func (b *Block) Parent() snowman.Block {
	parentID := ids.ID(b.ethBlock.ParentHash())
	if block := b.vm.getBlock(parentID); block != nil {
		return block
	}
	return &missing.Block{BlkID: parentID}
}

// Height implements the snowman.Block interface
func (b *Block) Height() uint64 {
	return b.ethBlock.Number().Uint64()
}

// Verify implements the snowman.Block interface
func (b *Block) Verify() error {
	// Only enforce a minimum fee when bootstrapping has finished
	if b.vm.ctx.IsBootstrapped() {
		// Ensure the minimum gas price is paid for every transaction
		timestamp := b.ethBlock.Header().Time
		minGasPrice := b.vm.minGasPrice.GetMin(new(big.Int).SetUint64(timestamp))
		for _, tx := range b.ethBlock.Transactions() {
			if tx.GasPrice().Cmp(minGasPrice) < 0 {
				return fmt.Errorf("block contains tx %s with gas price too low (%d < %d), timestamp: %d", tx.Hash(), tx.GasPrice(), minGasPrice, timestamp)
			}
		}
	}

	vm := b.vm
	tx := vm.getAtomicTx(b.ethBlock)
	if tx != nil {
		pState, err := b.vm.chain.BlockState(b.Parent().(*Block).ethBlock)
		if err != nil {
			return err
		}
		switch atx := tx.UnsignedTx.(type) {
		case *UnsignedImportTx:
			if b.ethBlock.Hash() == vm.genesisHash {
				return nil
			}
			p := b.Parent()
			path := []*Block{}
			inputs := new(ids.Set)
			for {
				if p.Status() == choices.Accepted || p.(*Block).ethBlock.Hash() == vm.genesisHash {
					break
				}
				if ret,